Electronics Forum | Wed Mar 15 00:44:39 EST 2006 | vicknesh28
Would i be able to judge how good is a reflow profile from the appearance of the flux residue? Often times i come across flux (not sure if residual) between a non-wet QFP lead and the reflowed solder paste on the pad (it's sandwiched between the bott
Electronics Forum | Wed Dec 20 04:43:36 EST 2006 | greg york
Any decent flux would volatise off with the heat of the wave unless absorbed into the solder mask. Test this by trying to clean in alcohol or common solvent aerosol, if it does not clean then it is probably Mineral Salts from solder mask fillers. Ano
Electronics Forum | Fri Jul 06 12:11:34 EDT 2007 | james
We are starting to see issues with using Kester WS R562 with lead free components. The joints look grainy on almost all of the 0402'2 and other small components. Some of the solder does not solder to the terminations. These are hybrid boards which
Electronics Forum | Tue Jan 17 21:40:08 EST 2012 | gaz
I'm testing SN100C, and with our 5 zone oven I seem to be able to fix one issue by changing the profile, but that might introduce a new problem. Some profiles work very well on most components, but have issues on other components. These are usually 0
Electronics Forum | Wed Feb 13 10:39:36 EST 2019 | spitkis2
The QFN will add an insignificant amount of thermal mass since its all in the housing. You just need to make sure the package does not exceed the recommended peak and duration so as not to damage the die internally. Usually the limit is around 250-
Electronics Forum | Thu May 09 11:37:12 EDT 2019 | slthomas
I'm curious about what you guys do for Pb-free HASL profiling. We seldom see this finish (only on consigned boards or if they specify it directly, which is very rare) so we don't have a lot of experience. Certainly we get better results with high
Electronics Forum | Fri Nov 27 13:04:47 EST 1998 | Phillip Hunter
| Hi | I have been conducting my first reflow profiles. Most of the texts that I have read suggest soldering the thermocouples to a populated pcb. I am finding this very difficult. I have been using a high melting point (Sn5 / Pb95) solder and the
Electronics Forum | Thu Jan 09 11:29:41 EST 2014 | spoiltforchoice
Thermal profiling typically requires a profiling kit, this will include a thermally insulated datalogger that follows your PCB through the oven connected to a number of thermocouples which you might affix to your PCB using heat resistant tape or usin
Electronics Forum | Thu Apr 15 20:41:22 EDT 2004 | Ken
There are ledgitimate reasons for checking furnace calibrations, but let me clarify what that is. 1. TC's are not necessarily calibrted. Not unless you need "absolute" accuracy. TC's operate against a (non-linear) standard +/- a tolerance. Most
Electronics Forum | Tue Feb 19 09:41:26 EST 2008 | slthomas
ECD sells the MOLE, and they sell both the Oven Rider and the Wave Rider to accompany it. The thing is, you can profile both an oven and a wave machine without either if you're willing to just solder your thermocouples to a board. The nice thing ab
